Telegraphy.



P. B. DELANY.

TELEGRAPHY.

APPLICATION FILED 1uNE4. IsII.

Patented Aug. 6, 1918.

UNITED' STATES PATENT OFFICE.

PATRICK B. DELANY, OF SOUTH ORANGE, NEW JERSEY, ASSIGNOR TO SECRET TELE- GRAPH COMPANY, 0F NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TELEGRAPHY.

Specification of Letters Patent.

Patented Aug. 6, 1918.

Application med June 4, 1917. serial No. 172,684.

To all whom it may concern:

Be it known that I, PATRICK B. DELANY, a citizen of the United States, residing at South Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in T elegraphy, of which thefollowing'is a specification.

My invention contemplates improved means for forming and transmitting telegraphic signals over telephone circuits or other circuits operated through microphone contacts.

This broad idea is known, but so far as I am informed all previous apparatus in which it has been embodied have employed metallic connections, clamped or otherwise secured to the microphone. and the telegraph key 'or other sounder that may be used. Under such conditions perfect results are seldom attained because the back stroke of the key lever sets u a vibration on the microphone frame of su 'stantiall the same force as the forward stroke whic `is the reading or recording stroke. In consequence the signals become confused; the dashes may be interpreted as spaces, or vice versa, and the signals are as likely to be sounded in the reverse order as in proper se uence.

I overcome this di culty by providing a telegraph key .so disposed relatively to the microphone that the two are normally out of contact. Only the positive actuation of the key causes its impact upon the base ot' the microphone. The backl stroke or release movement of the key can result only in contact with the base or mounting for the key, but not with the microphone frame. Such vibrations asmay result are weak and of different quality from those positively created.

In the accompanying drawing I have shown means appropriate for a practical embodiment of my invention, Figure 1 being an elevation of an ordinary telephone instrument with a removable subjacent mounting constitutn a rest for the instrument and a housin or the telegraphic device, Fig. 2 a plan o the mounting, and Fig. 3 a section on line 3- -3, Figa-2.

As shown the microphone transmitter is or may be an ordinary telephone 1 having the usual parts, including the screw 2 in its base.

The removable key stand 3 is shown formed with a circular seat t in its top adapted to receive the base of the portable telephone instrument. 5 designates the key lever. It may be of any desired form. I have shown 1t pivotally supported in bearings 6 and provided with a contact screw 7 adapted to contact with the point 2. 8 is an adjustable stop to limit the upward movement of the button part of the key lever and backward movement of contact 7. This stop normally rests upon the key frame, as at 9, being held by the pressure of a spring 10.

Thus it will be seen there are no permanent connections between the telephone instrument and the key stand. The instru-l ment may be used as a desk telephone in the ordinary way but the stand furnishes a simple and adequate support. The instrument requires no changes whatever in its ordinary construction. Manifestly the con,- struction shown is capable of attaining the desired objects herein set forth.

I claim as my invention:

1. In telegraphy, the method of mechanically operating a microphone transmitter by a Morse key making metallic contact with said transmitter for vibrations representing signal impulses and making unmetallic contact with said transmitter for weaker vibrations representing termination of said signals.

2. In telegraphy, a microphone transmittel', and a telegraph key detached therefrom adapted to mechanically vibrate said microphone transmitter for the transmission of signals, said key being in contact with the microphone only during the transmission of a signal unit.

3. In telegraphy, a microphone transmitter having a base, a telegraph key, an independent holder for said key, said holder being adapted to receive and removably support said transmitter, and means for bringing said key and said transmitter within range tor direct metallic contact only upon operation of the key.

4. In telegraphy, a microphone transmitter having a base, an independent key stand adapted to removably support the base of said transmitter, a key mounted in said stand and adapted to be actuated to contact with said base to create signals, and means for arresting the back stroke of said key, said means being independent of and out of metallic contact with the base.

5'. In telegraphy, la microphone having a supporting stand and base therefor,` a .detachable holder for receiving said base, and a telegraph transmitter in said holder.

6. In telegraphy, a telephone transmitter having a supporting stand and base therefor, a removable holder for receiving said base, Aand aMorse signal transmitter in said holder. f A

7l In telegraphy, a microphone transmit- `ter having a base, and a telegraph key beneath andv spaced from said base and adapted to contact therewith only upon operation of the key.

8. In telegra hy, in combination With a telephone stan ard provided on its bottom with a metallic contact, of a base beneath said standard, a telegraph key Within the base spaced from the standard when idle, and means on the key for striking the metallic .contact on the standard for producing mechanical vibrations therein upon the -a seat for receiving said standard, and a telegraph key Within said [base below the seatgsaid key being adapted to engage the standard only upon operation of the key for transmitting telegraphic signals.

10. In telegraphy, an attachment for telephone'standards, comprising a base having a seat upon which the standard is adapted to removably' rest, and a telegraph key Within said base below the seat, and means upon the key for engaging thel standard only upon operation of the key for transmitting telegraphic signals.

In testimony whereof I have Vhereunto subscribed my name.

.PATRICK B. DELNY. 

